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TPS62021DGQ Datasheet(PDF) 4 Page - Texas Instruments |
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TPS62021DGQ Datasheet(HTML) 4 Page - Texas Instruments |
4 / 18 page www.ti.com FB PGND SW VIN EN Undervoltage Lockout Bias supply Control Logic + − LoadComparator 1.25 MHz Oscillator Vref = 0.5 V Driver Shoot−thru Logic Soft Start + − + − Current limit Comparator SkipComparator Gm Saw Tooth Generator V I + − Vcomp S R + − Comp High Comp Low Comp Low 2 Comp High Comp Low Comp Low 2 − + Comparator Compensation Ref Ref PGND VIN GND MODE MODE SW (See Note A) TPS62020, TPS62021 SLVS076B – JUNE 2003 – REVISED APRIL 2004 PIN ASSIGNMENTS (continued) Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. EN 1 I Enable. Pulling EN to ground forces the device into shutdown mode. Pulling EN to VI enables the device. EN should not be left floating and must be terminated. VIN 2, 3 I Supply voltage input GND 4 Analog ground FB 5 I Feedback. Connect an external resistor divider to this pin. MODE 6 I The difference between TPS62020 and TPS62021 is the logic level of the MODE pin. The TPS62021 has an MODE active-low MODE pin. The TPS62020 is forced into fixed-frequency PWM mode by pulling the MODE pin high. Pulling the MODE pin low enables the Power Save Mode, operating in PFM mode (Pulse frequency modulation) at light load current, and in fixed frequency PWM at medimum to heavy load currents. In contrast, the TPS62021 is forced into PWM mode by pulling the MODE pin low. SW 7, 8 I/O This is the switch pin of the converter and connected to the drain of the internal power MOSFETs PGND 9, 10 Power ground FUNCTIONAL BLOCK DIAGRAM NOTE A: The TPS62020 has an active-high MODE pin. The TPS62020 has an active-low MODE pin. 4 |
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